Future suggestions

Today I posted on aquaticquotient.com forum request for opinions on my future and already prepared tank. I'd like to post it here as well. If you have something to say, please don't hesitate to contact me : lukas.podhola at gmail.com. Thank you .)

Note: First picture is property of ADA Company.

Hi all,
I'm preparing new tank (50x25x30cm - LxWxH) with 55W PL light (one tube), EDEN501 filtration, pressurized CO2 injection. Right now I have almost everything but certainty of layout.. I love low green lawns combined with elechocharis, utricularia, HC or glossostigma and stones. Something like this:


I played with my stones during one week and I got this:

front view

top view

I have several questions:

1. What do you think about substrate sloping?
2. What do you think about stones positioning?
3. What's your plant suggestion regarding technical equipment listed above?
4. What fertilizer would you use and what substrate would you use (both could be ADA)?
5. Would you use two kinds of substrate/gravel as Amano does nowadays? Why?

I still don't know when I establish this tank 'cos I don't have several things. I have relatively lot of time to play with stones, substrate sloping etc. I'd be really glad if you reply on this post with any opinion.

Thanks.
Regards Lukas :)